Theory of Machines MCQ
The Theory of Machines MCQ covers kinematics mechanics, dynamics governors, gyroscopes, governors, cams, gears, balancing basic vibration, and power transmission. These well-planned objective questions aid Mechanical Engineering students strengthen concepts and effectively prepare for competitive exams such as GATE SSC JE, RRB JE, ISRO, and PSU tests. Review these MCQs and answer them with explanations for better the accuracy of your questions and develop solid foundations in TOM.
Q1. A kinematic pair with surface contact is known as?
A. Lower pair
B. Higher pair
C. Rolling pair
D. Turning pair
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Q2. Which of the following is a lower pair?
A. Cam and follower
B. Gear teeth contact
C. Shaft rotating in a bearing
D. Belt pulley
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Q3. The number of degrees of freedom for a planar mechanism is given by which formula?
A. F = 3(n-1)-2j
B. F = 3n-2j
C. F = 2(n-1)-3j
D. F = j-3n
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Q5. The Grashof condition is used for which mechanism?
A. Slider crank
B. Four-bar linkage
C. Cam mechanism
D. Gear train
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Q6. In a cam-follower system, follower motion depends on?
A. Base circle
B. Pressure angle
C. Cam profile
D. Follower mass
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Q7. Which gear train yields the highest speed reduction?
A. Simple gear train
B. Compound gear train
C. Epicyclic gear train
D. Rack and pinion
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Q8. In a slider crank mechanism, the slider is equivalent to?
A. Revolute pair
B. Lower pair
C. Higher pair
D. Belt pair
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Q9. Which point on a cam follower trace is called the pitch point?
A. Where pressure angle is max
B. Where pressure angle is min
C. Point of zero lift
D. Point of maximum lift
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Q10. Which mechanism converts rotary motion to reciprocating motion?
A. Four-bar mechanism
B. Cam and follower
C. Slider crank mechanism
D. Gear train
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Q11. The point which instantaneously has zero velocity is called?
A. Dead centre
B. Instantaneous centre
C. Fixed point
D. Cut-off point
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Q12. Coriolis component of acceleration appears in?
A. Pure rotation
B. Pure translation
C. Rotation + sliding
D. Sliding only
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Q13. When does a governor control speed?
A. By torque control
B. By fuel control
C. By friction control
D. By thermal expansion
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Q14. Which governor is most sensitive?
A. Porter governor
B. Proell governor
C. Hartnell governor
D. Watt governor
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Q15. Static friction is highest at?
A. Start of motion
B. During motion
C. End of motion
D. Never
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Q16. Which clutch works on the principle of centrifugal force?
A. Plate clutch
B. Centrifugal clutch
C. Cone clutch
D. Belt clutch
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Q17. The mechanism used to lift the valves of IC engines is?
A. Gear train
B. Cam and follower
C. Four bar linkage
D. Chain drive
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Q18. Which belt has the highest power transmission capacity?
A. Flat belt
B. V belt
C. Timing belt
D. Rope belt
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Q19. Involute gear profile is preferred because?
A. No interference
B. Constant velocity ratio
C. Less wear
D. Easy lubrication
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Q20. Which gear is used for non-parallel and non-intersecting shafts?
A. Spur gears
B. Bevel gears
C. Helical gears
D. Worm gears
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Q21. The balancing of rotating parts reduces?
A. Noise
B. Vibration
C. Speed
D. Power
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Q22. Primary unbalanced forces occur due to?
A. Mass variation
B. Reciprocating masses
C. Rotating masses
D. Elastic deformation
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Q23. Secondary unbalanced forces occur at how many times crank speed?
A. Same speed
B. Twice
C. Half
D. Four times
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Q24. The function of flywheel is to?
A. Increase torque
B. Reduce speed fluctuations
C. Increase engine power
D. Reduce friction
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Q25. Which mechanism produces intermittent motion?
A. Gear train
B. Cam mechanism
C. Geneva mechanism
D. Slider crank
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Q26. The pressure angle in gears affects?
A. Wear
B. Load carrying capacity
C. Backlash
D. Pitch circle
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Q27. The ratio of output torque to input torque in a clutch is?
A. Efficiency
B. Friction ratio
C. Torque ratio
D. Gear ratio
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Q28. Which governor works at high speed?
A. Watt governor
B. Porter governor
C. Hartnell governor
D. Proell governor
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Q30. In gyroscopic action, the rotor resists?
A. Change in direction
B. Change in speed
C. Change in mass
D. Change in temperature
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